rohitsanj

// https://leetcode.com/problems/number-of-submatrices-that-sum-to-target/
class Solution {
public:
    int numSubmatrixSumTarget(vector<vector<int>>& matrix, int target) {
        int r = matrix.size(), c = matrix[0].size();
        vector<vector<int>> pref(matrix.size() + 1, vector<int> (matrix[0].size() + 1, 0));
    
        for(int i = 1; i < r + 1; i++)
        {
            for(int j = 1; j < c + 1; j++)

rohitsanj

#include <iostream>
using namespace std;

class BST
{
public:
    int data;
    BST *left, *right;
    void insert(BST *, int);
    void preorder(BST *);